Selling a property in Hawaii comes with tax considerations that many sellers don't discover until they're already at the closing table. Between federal capital gains tax, the potential to defer that tax entirely through a 1031 exchange, and Hawaii's own withholding requirement for non-resident sellers, understanding these three pieces ahead of time can save you from an unpleasant surprise on closing day.

Capital Gains Tax: What You Actually Owe the IRS

When you sell real estate for more than you paid for it, the profit is generally treated as a capital gain and is subject to federal tax. How much you owe depends on how long you owned the property and whether it was your primary residence.

If It Was Your Primary Residence

Under IRC Section 121, homeowners who owned and lived in the property for at least two of the five years before the sale can exclude a significant portion of their profit from federal tax entirely. For 2026, single filers can exclude up to $250,000 of gain, and married couples filing jointly can exclude up to $500,000. Most homeowners who qualify for this exclusion end up owing zero federal capital gains tax on the sale.

If It Was an Investment or Vacation Property

If the property wasn't your primary residence, for example a Kauai vacation rental or an investment condo, the Section 121 exclusion does not apply, and the full gain is taxable. Long-term gains (property held longer than one year) are taxed at 0%, 15%, or 20% depending on your total taxable income, while short-term gains (held one year or less) are taxed as ordinary income at your regular tax bracket.

The 1031 Exchange: Deferring Tax on Investment Property

If you're selling an investment or business-use property, a 1031 exchange lets you defer capital gains tax by rolling the proceeds into a new "like-kind" investment property rather than cashing out. This is one of the most powerful tools available to real estate investors, but it comes with strict, unforgiving deadlines.

The 45-Day and 180-Day Rules

Once your relinquished property closes, you have 45 calendar days to formally identify potential replacement properties in writing, and 180 calendar days total from the original closing to complete the purchase of the replacement. These two windows run concurrently, not back to back, and neither can be extended for any reason short of a presidentially declared disaster.

Eligibility Basics

• Both the relinquished and replacement property must be held for investment or business use, not personal residence
• Properties must be "like-kind," which for real estate is interpreted broadly (most real property qualifies for other real property)
• The same taxpayer who sells the relinquished property must take title to the replacement property
• Replacement property value and debt generally must be equal to or greater than what was sold to achieve full deferral

HARPTA: What Non-Resident Sellers Need to Know

If you're not considered a Hawaii resident for tax purposes, even if you've owned the property for years or previously lived in Hawaii, the Hawaii Real Property Tax Act (HARPTA) requires a withholding at closing to ensure the state eventually collects any capital gains tax owed.

Current Withholding Rate

As of 2026, HARPTA requires the escrow company to withhold 7.25% of the gross sales price, not the net profit, and remit it to the Hawaii Department of Taxation. This is a critical distinction: even if you sell at a loss, the withholding is still calculated on the full sales price unless you obtain an exemption in advance.

HARPTA Is Not a Final Tax Bill

The withholding is a deposit against your actual tax liability, not an additional tax. If the amount withheld exceeds what you actually owe, which is common, you can recover the difference by filing a Hawaii non-resident income tax return (Form N-15) for the year of the sale, or by filing Form N-288C to request a faster refund before that return is available.

Common Exemptions

• The seller is a bona fide Hawaii resident at the time of closing (Form N-289)
• The sale is part of a qualifying 1031 exchange
• The property was the seller's principal residence and the sales price is $300,000 or less
• There is no taxable gain, or the sale results in a loss (requires an approved Form N-288B)

HARPTA vs. FIRPTA

Non-resident sellers who are also foreign nationals may face a second withholding requirement under the federal Foreign Investment in Real Property Tax Act (FIRPTA), separate from and in addition to HARPTA.

Putting It All Together: A Practical Checklist

Final Thoughts

Taxes on a Hawaii property sale are rarely as simple as "pay X percent of the profit." Between the federal exclusion for primary residences, the deferral opportunity of a 1031 exchange, and Hawaii's own withholding rules for non-residents, the right strategy depends heavily on your residency status, how the property was used, and how far in advance you plan. The sellers who come out ahead are almost always the ones who loop in a CPA and an experienced escrow officer months before listing, not the week before closing.